undercommit-install

#!/usr/bin/env bash
set -euo pipefail

# Configure a place for custom hooks to be installed alongside Overcommit hooks
# (https://github.com/brigade/overcommit). This is useful if you wish to install
# hooks that are specific to your environment, e.g. regenerating editor-specific
# ctags on post-checkout.
#
# After running this script:
#
# - Overcommit hooks are renamed to .git/hooks/{hook}-overcommit.
# - Custom hooks can be installed as .git/hooks/{hook}-custom.
# - Hooks in .git/hooks call Overcommit hooks, then custom hooks, if they exist.
#
# Hooks that aren't managed by Overcommit are ignored.

if [[ ! -d .git ]]; then
 echo "no git repo found in $(pwd)" >&2
 exit 1
fi

# ruby -r overcommit -e 'puts Overcommit::Utils.supported_hook_types.join("\n")'
OVERCOMMIT_HOOKS="
commit-msg
post-checkout
post-commit
post-merge
post-rewrite
pre-commit
pre-push
pre-rebase
"

HERE=$(cd "$(dirname $0)"; pwd -P)

cd .git/hooks
cp "$HERE/master-hook" undercommit-hook

for hook in $OVERCOMMIT_HOOKS; do
 if ! grep -q OVERCOMMIT $hook; then
 echo "$hook doesn't look like an Overcommit hook; aborting"
 exit 1
 fi
 mv "$hook" "${hook}-overcommit"
 echo "Moved $hook -> ${hook}-overcommit" >&2
 ln -s undercommit-hook "$hook"
 echo "Install custom hook at ${hook}-custom." >&2
done